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Real-time speech enhancement and its DSP system implementation

Author: AnWenYan
Tutor: PengQiZuo
School: University of Electronic Science and Technology
Course: Information and Communication Engineering
Keywords: Speech Enhancement DSP Spectral subtraction Real-time processing
CLC: TN912.3
Type: Master's thesis
Year: 2009
Downloads: 227
Quote: 6
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Abstract


In the actual environment for voice calls , the call both sides vulnerable to ambient background noise , thus affecting the call results. This phenomenon in some specific application environment is particularly evident , for example in factories, airports , and some military applications , a strong background noise will greatly affect call quality , even the call impossible. Real-time speech enhancement research is to address this real strong noise environment , the algorithms in real-time software and hardware system platform to achieve as much as possible to reduce background noise and improve voice quality, so as to achieve the effect of speech enhancement . As to ensure real-time processing , real-time speech enhancement system processing capacity of the hardware requirements are very high , and this requires the development of related algorithms with continuous improvement . With the recent DSP (Digital Signal Processor) chip continues to develop, as well as supporting the development platform of continuous improvement, real-time voice enhancement technology hardware system can be well implemented , and on different occasions to get a good application . Thesis introduces several classic speech enhancement algorithms , including noise cancellation method, spectral subtraction and Wiener filtering , on their advantages and disadvantages are analyzed and compared . On this basis , to improve the existing algorithms , used in the formation of this test based on the improved voice-activated spectral subtraction speech enhancement method . This algorithm has low complexity and easy to implement in real-time hardware system to meet the requirements of real-time speech enhancement . Simulation results show that , with better treatment effect. This paper introduces the design of DSP -based TMS320VC5509A model hardware and software processing systems around the DSP chip select relevant other chips , introduces the hardware system and between the various components of the connection, each module software system configuration and initialization algorithm on the system implementation. Implemented on the system platform used by the algorithm . After testing, at the system can in real time play a very good inhibitory effect of background noise , so as to achieve the purpose of the speech enhancement .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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